Form for concrete culverts.



S. F. WALTER.

FORM FOR CONCRETE CULVERTS.

APPLICATION FILED MAR. 12. 1915.

1,176,997.. Patented Mar. 28, 1916.

2 SHEETS-SHEET I.

jj v .1

THE COLUMBIA PLANOGRAPH c0. WASHINGTON. D. c

v s. F. WALTER. FORM FOR CONCRETE CULVERTS.

APPLICATION FILED MAR. 32, $915.

6 1 9 l 00 2 PM a M d ow l n flu iv a P Inventor Attorneys 2 SHEETS-SHEET 2 'rme COLUMBIA PLANOCRAPH CO.,-\VASHINGTCIN, D. L

SAMUEL IE. WALTER, 0]? SMITH CENTER. KANSAS.

FORM FOR CONCRETE CULVERTS.

Specification of Letters Patent. I Patented Dial. 28, 1916.

Application filed March 12, 1915. Serial No. 13,881.

To all whom it may concern:

Be it known that I, SAMUEL F. VALTER, a citizen of the United States, residing at Smith Center, in the county of Smith and State of Kansas, have invented a new and useful Form for Concrete Culverts, of which the following is a specification.

This invention relates to a form especially designed for use in making concrete culverts which are substantially semi-cylindrical, one of the objects of the invention being to provide a form which is light and durable, the parts of which can be assembled readily, and which can be easily removed from the molded object.

lVith the foregoing and other objects in view which will-appear as the description proceeds, the inventionresides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, can be made within the scope of what'is claimed, without departing from the spirit of the invention.

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings :Figure 1 is a horizontal section through the form in use. Fig. 2 is a side elevation of the form resting on one side. Fig. 3 is a central vertical longitudinal section through the inner member of the form in the position shown in Fig. 2. Fig. 4 is an elevation of the meeting portions of the inner pan. Fig. 5 is a plan View of the adjusting means used in connection with the inner form.

Referring to the figures by characters of reference 1 designates the arcuate wall of the outer form, the same being formed preferably of sheet metal and being reinforced v by angle irons 2 or the like the ends of which extend beyond the wall and lap the ends of angle irons 3 to which they are connected by means of bolts 4 or in any other suitable manner. The angle irons 3 support the outer tie wall 5, said outer tie wall having side flanges 6 which extend outside of the adjacent edge portions of the wall 1, as shown particularly in Fig. 1 thereby holding them against movement outwardly from each other. Reinforcing angle strips 7 are secured along the outer sides of the wall 1 between the angle irons 2 and near the ends of the said side walls.

The inner form includes a tie wall made up of opposed plates 8 having their inner edge portions lapping, one of said edge portlons being provided with longitudinal slots 9 for the reception of clamping bolts 10 extending through the other plate of the pan. Wall 8 is provided with side flanges 11 designed to lap the adjacent side edges of the side walls of the inner arcuate member 12 which is preferably formed of sheet metal and is reinforced by arcuate angle irons 13 secured to the inner face thereof. The ends of these angle irons 13 are secured to cross strips 14.- which rest on the wall 8, bolts 15 being employed for fastening the parts to gether. Reinforcing angle irons 16 are secured to the inner faces of the sides of the inner form 12 and close to the ends thereof, these angle irons 16 having openings 17 for the reception of the ends of rods 18 which diverge from threaded stems 19. Said threaded stems are engaged by a turn buckle 20. 1

In using the form herein described the parts are set up on end so as to form a continuous space therebetween and said space is then filled with concrete. After the concrete has set, the inner form is removed by first unfastening the cross strips 14 from the reinforcing angle irons 13. By means of turn buckle 20, the side portions of the inner form are drawn toward each other, so as thus to move out of contact with the molded object. Plate 12 can then be withdrawn from said object, after which the sections of the wall 8 can be adjusted toward each other, thus to become disengaged from the molded object, after which said pan can be easily removed. The outer form is removed simply by unfastening the bolts 4, whereupon the wall 5 can be withdrawn from the molded object and the plate 1 can likewise be removed.

What is claimed is:

1. A form of the class described including an outside tie wall, an arcuate plate having its side portions restrained by the tie wall, reinforcing members secured to the plate, reinforcing members extending across the tie wall and detachably connected to the ends of the first mentioned reinforcing members, a laterally adjustable inside tie wall, an arcuate plate having its sides restrained by the inner tie wall, connected reinforcing members secured to the inner side of the inner plate and upon the inner tie wall, and

means connecting the sides of the inner plate for drawing the sides of said plate toward each other when the reinforcing members are disconnected. i

2. A form of the class described including inner and outer tie walls having side flanges, the inner wall consisting of adjustably connected sections, inner and outer arcuate plates extending into engagement with and restrained by the respective tie walls, arcuate reinforcing members upon the outer surface of the outer plate and upon the inner surface of the inner plate, reinforcing members extending along the outer face of the outer tie wall and detachably connected to the ends of the reinforcing members on the outer plate, and reinforcing strips upon the inner tie wall and detachably connected to the ends of the inner arcuate reinforcing members.

3. A form of the class described including'inner and outer tie walls having side flanges, the inner tie wall consisting of adjustably connected sections, inner and outer arcuate plates extending into engagement with the respective tie walls, arcuate reinforcing members upon the outer surface of the outer plate and upon the inner surface of the inner plate, reinforcing members extending along the outer face of the outer tie wall and detachably connected to the ends of the reinforcing members on the outer plate, reinforcing strips upon the inner tie wall and detachably connected to the ends of the inner arcuate reinforcing members, opposed threaded stems connected to opposite sides respectively of the inner plate, and a turn buckle connecting the stems.

l. A form of the class described including spacedarcuate angle irons, an arcuate plate secured to the inner faces thereof, a tie wall having side flanges lapping the sides of said arcuate plate, reinforcing angle irons extending across the outer face of the tie wall and detachably connected at their ends to the ends of the arcuate angle irons, adjustably connected plates having side flanges and constituting an inner tie wall, an arcuate plate having its side portions extending into engagement with the inner tie wall, arcuate reinforcing members secured to the inner surface of said inner arcuate plate,

reinforcing strips extending across the innertie wall and detachably connected to the ends of the last mentioned arcuate members, and means connecting the sides of the inner arcuate plate for drawing thesamef toward each other when the reinforcing members are disconnected.

In testimony that I claim the foregoing as my own, I have hereto aliixed my signa: ture in the presence of two witnesses.

SAMUEL F. WALTER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

